I2C connetion 2 Arduino and other sensors

Projects Networking, Protocols, and Devices
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Hi, i want to comunicate on one i2c with another Arduino and some sensor boards and a port expander. How to set the adress . e.g 0x45
Best Thomas

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By expanding post #2, I would say--
Every Slave in the I2C Bus is assigned a 7-bit address. So, when your given address 0x45 is expanded in bit form, we will get: 010 0101 and NOT 0100 0101.

In the sketch of Slave, just the include the following two lines:

#include<Wire.h>  //in the Global area

Wire.begin(0b0100101);  //in the setup function